public class Actor
{private string name;private int height;public Actor(string name, int height){this.name = name;this.height = height;}public string Name{get { return this.name; }}public int Height{get { return this.height; }}public int CompareTo(object obj){return this.height - ((Actor)obj).height;}public string GetName(){return this.name;}
}

using System;namespace WestGarden.IDAL
{public interface ISelectPlayer{string GetName();int CompareTo(object obj);}
}

using System;using WestGarden.IDAL;namespace WestGarden.DAL
{public class Actor:ISelectPlayer{private string name;private int height;public Actor(string name, int height){this.name = name;this.height = height;}public string Name{get { return this.name; }}public int Height{get { return this.height; }}public int CompareTo(object obj){return this.height - ((Actor)obj).height;}public string GetName(){return this.name;}}
}

using System;using WestGarden.IDAL;namespace WestGarden.DAL
{public class Actress:ISelectPlayer{private string name;private int weight;public Actress(string name, int weight){this.name = name;this.weight = weight;}public string Name{get { return this.name; }}public int Weight{get { return this.weight; }}public int CompareTo(object obj){return ((Actress)obj).weight - this.weight;}public string GetName(){return this.name;}}
}

using System;using WestGarden.IDAL;
using WestGarden.DAL;namespace WestGarden.Web
{public partial class Select : System.Web.UI.Page{protected void Page_Load(object sender, EventArgs e){Actor actor1 = new Actor("潘长江", 150);Actor actor2 = new Actor("刘德华", 180);Actress actress1 = new Actress("巩俐", 120);Actress actress2 = new Actress("周迅", 80);Response.Write("最佳男演员是："+WhoIsBetter(actor1, actor2)+"</br>");Response.Write("最佳女演员是："+WhoIsBetter(actress1, actress2)+"</br>");}//这里就象一个USB口一样工作着，无论你插上的是男演员、女演员...，只要它继承的是ISelectPlayer接口。public string WhoIsBetter(ISelectPlayer a, ISelectPlayer b){if (a.CompareTo(b) > 0)return a.GetName();elsereturn b.GetName();}}
}